Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details 2)

v3.8.0.1
Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details 2) - shares
shares in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Conversion of common units    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 3,221 3,446
Conversion of Series I preferred units    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 176 176
Forward Equity Sale Agreement    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 7,500  
Weighted average restricted stock and deferred shares    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 444 392
Weighted average options    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 60 140
Corporate Office Properties, L.P. | Forward Equity Sale Agreement    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 7,500  
Corporate Office Properties, L.P. | Weighted average restricted stock and deferred shares    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 444 392
Corporate Office Properties, L.P. | Weighted average options    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 60 140
Corporate Office Properties, L.P. | Conversion of Series I preferred units    
Antidilutive securities    
Antidilutive securities excluded from computation of diluted earnings per share (in shares) 176 176